According to research from customer relationship marketing agency Merkle, 87% of internet users checked personal email daily in 2010, a number that has changed little since 2007. Among those with a separate email account for commercial email, 60% checked daily, down just 1 percentage point since 2008.

Further, social media usage is hardly taking away from email. Rather, social media users are significantly more likely than other internet users to check their email four or more times per day, and less likely to check infrequently.

Email is very well known as a direct-response tool, and there is plenty of free advice available to help sellers maximize their results and measure them effectively. But what about tips for editorial emails designed with content instead of sales as the primary driver?

Hotmail seems to have made some adjustments to their filtering recently. Given some senders are unaffected, this appears to be a threshold change or a calculation change, tightening up their standards. The changes have been around for long enough now it does look like the filtering is working as intended and Hotmail is not going to roll these changes back.